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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b05bcf1d9e4699a478c5477b92224b04a4133fc086bf7e4ce767066cb1c2e68' 
  AND token = 'sXXpRawbaqXnaXmLXftFj0zg4vRRAO2SKPVpD3d8Cuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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