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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e2f400ae8508cac9df5a4a672cfb5f76886e40d81deeaadf120b53c7bd798' 
  AND token = 'fjRg2OSC5W6ieOSo4SrHnE0oie5rT5TFY92fUF6Oqjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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