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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be1969f94ea7040724c431a213ef23396ce6dae9c297020f7485692e5f11839' 
  AND token = 'FAGwBAj69HyhiDjonfpTArcbyGpsn2lx+8P821KPDS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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