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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3623af9c3c04b889033b23964c1cd3ce95d038cad125edfe316a3f2f37d77e4' 
  AND token = 'mfGQb31H4gXKw/V+GXUxaxg9SIxjdwLgocIFETzz7VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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