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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c3d36c15f0042568142b4b4947d2e2786dbc80166dc6aeff110e9ab7602059' 
  AND token = '+yi3xudGoupXPJ6Es1aHCVMTTRkLxE++gmnqjlwy+Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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