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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026b8ea4fbdb41586ce288fd2e8d2d6ce96b404f623a2fc86d3f98b8dcb6dab3' 
  AND token = 'hjLUu4luL3zPyWsN+iYIZOqedUe3itcaIL3l4YL+E58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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