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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c826f8639cbca758b0ed7fccdddfe20cea54937eb191f877a7cf4ad2636e454a' 
  AND token = '5dHJmrNNwj+0f+8Zs49xZzm4sFOyOObQIl2sql3FX2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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