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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a924bea7975215f8154ff609b4bfafd15547e5627e6196dad9bcdba66458f4' 
  AND token = 'T8+v3IIoY2lF5GTGhNDPWWufiKQr3kb3D3ZG/0LNb4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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