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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fffac9587279bbb6360916547fbf6c49e66b6800df942f7f9336c21d89b94de' 
  AND token = 'kNF/l8Kuwe2dlIWTsaLQF/xCGkVWW6aQKutMlZnDDZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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