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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c177873835af6925edd864c3def6be2c59aa2f5831331ee254c8403be1af71' 
  AND token = 'oXYaBlrfr6G58nXB8RhyzFn1ivu++Tx+DGTn3Ys1JDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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