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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883395ac8f241b85ec98d5b2e957a7cdaf3468265d8dd73e7c5b1f996b980866' 
  AND token = 'pf4zDDcmZo8vwVzaTlG3WAHJWlRPZMEj7ku9AbamQMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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