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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32e85faca9736e1dbe0b84cb0ca6f886b25b112b3013d9e22fd526cc088d89a' 
  AND token = '3L04gkn1iHxpdBowD62Io1hz9lI9sb+YngPSCzJDw6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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