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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3a10dc8e267a702773853ed30a8c2b786ca1bdb4d9ebd6358cd0f4c6cd9dce' 
  AND token = 'X5j6ei2eFcuLFxK4cOOh9yYa06VC5hRAGJ9VKYCgVjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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