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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9550c94cbb6f4df292a104b0b2072f3c558f39cfd46bc8c6ac195b392371eb5a' 
  AND token = 'r+RTP/PmknRXdesF38zF17i/o7OoOnnOaFrSiY1kY4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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