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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bcf255f642317098b3f0c20d78ad2ec82279571a2d0d855c6d90ef0b6b0883' 
  AND token = 'CexYBqpUYsMR8w7Od37Z64ZDFSqD4TPjf2VnPWaUamE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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