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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ffb6b1b7da65a9d43f3b8cf0de4ec5153b0803eb388f3dda1d9464ed003ee5' 
  AND token = 'JoggkKIELC3ftOI8FokQzkss74z9dACp8unL3aN3UxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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