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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2c24e3063bfe1252891eec1dc337d3b0e2d7c9736b9a1fdac66a857bc6d91d' 
  AND token = 'I8pPqVbdI/ZdpfDMxmWjVQajrMGvycC3d+7Jbu0eKlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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