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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faf03eea9d6ad6eacd8e3ff7473fb2e0bbe31195847baaff87ff3c7734663f4' 
  AND token = 'JL7Tls3QOqGvi3Sj7JR6+yQUM9iZYKtV8rizWolZ/70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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