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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c7ce13203b0fefe4ffa3278d6bac1acb2b0db1044fe63bcbda931ef413c6f2' 
  AND token = '5CrX105scw7cH6SfcsQ8Qn1x8kG90M5u7sQxWZ5PkxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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