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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00000ce9803b8e607c611be7bb08f394983950d8844f9695b91caa6f6a19f1fa' 
  AND token = '7yR02ApKTJHtWWXQKB1SG5u62aio3kKvsooPsEGusl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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