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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06801b48ac0c1d50beac77f42a13a9ad83318edc070d9bba3901812e6d5d036d' 
  AND token = '2A0w0hFwZD81XLVG8Z51Pnpj+dFJOAsdn90/u0KfrhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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