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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd8501326a5016da5f4c3907881b5b41030d171efdfba85903453659df5ac6b' 
  AND token = 'DjukhPfHgrzdCLdc/3TUxMCpGdoMbXHcO3rCOLcSJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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