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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8829a6ee296c3cf3fb0067323417f92b5bb0ded04b3ef1f78064853bd39465' 
  AND token = 'Pwq3FSQ/8InpEr3UEUmuVsfQ6qPD605ujzrMSMEO4Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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