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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a133fb64e5965570c1ffc90cb221390eac30ed8c0fab22e0ce77647b29ea9494' 
  AND token = 'L7srwv7E3otGafR4FMgGvaSgF3RcqH0HxTQG4BNYjbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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