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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7f59f7aec3d45eb70edd1d103d34deea0ccc4d758b22a56e3413f643b6855d' 
  AND token = 'RrFhBYYBjlfcJkqfqyqXxR0Qrcz23X+Tiwkq2uwBd0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}