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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc39162bda36cd6d2c9cdf6437349b7462d1eb32a70857af6e8e80cdb0343c0' 
  AND token = 'd9a6uVJ5nGuXyY7GMa/MVZu2h0swGaQO+USb5NiC5ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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