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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc62dcc1038a21e1bd4cbdd704f46483826b1f3c3864f7abded4202d413df79' 
  AND token = 'JquFctSvh8dhWCW7KQUJePF7S9OdEgMlQr+61JddRyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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