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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0692c454a0994d2662d1d60595edf5cc09c7b06e3bfc97adc60996f34dcb1d4' 
  AND token = 'MGd3UcWFmqekrx5iCIS4f6TcoaPgjX64HwnIT27gCUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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