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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799a254fa287ea7ccfc76b2431d33c3b54b5038c10fa0388885d625803c31ee9' 
  AND token = 'qzMKaq2I4P90h8fchcTM4WcUKE84jrOq3SV+lZrwdH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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