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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01019294679e3f34161fe18bb438ef99d4e457a4672e9636578e4653098a922' 
  AND token = 'Yye2wPJhF8J/WiJSUfwiD0QnVs1MpK5ewwx0jcpIf/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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