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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ae9879e5551704281b24bbb46b3d8022f2d296251ce45b29def7ae307ef5e7' 
  AND token = 'AV3yg0hPNJsHQHQoSN3Pro2VZqR/5Nm1/58Y3eYpub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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