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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a9b58c14ec4c8f9245e66264fa1433aea2c72684e556d72a851dda62f15cd9' 
  AND token = 'CXKjL8evtFbTmELtTh5h2ah/gUI99b2BIDYlOOV9f2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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