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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a982b847f126896d063ed21376f27142f30ebe7425406a8aebe27298ac67e5' 
  AND token = 'hHIgi0oZNYIyH13+CnSWTgZ8wV4IjPSA300S5VOiL7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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