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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e1e21e825cbb43b53fa3985c4afaadc0226515706924d00bcc0dd4c1eccd9e' 
  AND token = 'ehfdw2h6lOx6pqh5gk6pPIlugx+iW3GlBuLe+AsRzLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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