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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c755985db0c1d565059e7e84e6daa91db3edcd3ed264f467ab343c8119aac293' 
  AND token = 'e2DqiMIweuD8ThbOic4vFOGBdd9RpXt8hdqm7Wug0cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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