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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcfe7ecfd806177b1df58a8b72a47a0883963b9d47fcf00ca297fe6d029c7c4' 
  AND token = 'f9RXTSs/F+1asKm2wqE5576ywhX/6JIXiq51YFz21kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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