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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c1d48fb1bab9c5d4a8afec90c71d1368c16ba38d5904b1b6a970107879bd55' 
  AND token = '1CZvdOxqaUoKYQXRHXwDgRMrb28UoT/Og9JJY1O5DHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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