SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34b8604c62b82ec254460a6b93511224fd2a7e48c9456a9a52045d67f3e5fa8' 
  AND token = 'G+SlLlGQcKQ/Anfl2y7jCv11LBMIZfUpvN0d6wL/GPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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