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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b752da6a6a4177c7211b5b1d1ccc4272b223b5c812d1c28463c530510a5388dc' 
  AND token = 'hoC9cDVNws2Xct0v8PU5RjkqWLufgxXqhh4HY3dM8q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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