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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168ec0b95d906ece349917bd52a090deba0f639963d5b8c8e97678d980d9f07c' 
  AND token = 'gIBJ8RMUHX2Tq01sg9gAcyihxTtFuhdJ0PNjD5K8b4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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