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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09a27f0e533e9ca8d545b3ee02913aa1ff985ae77b946f0f9954d07252cc75f' 
  AND token = 'a/rK1rfpGB0N4aQMy9FCynn9D4Mm9wQGr6JywLYs3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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