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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a8636a5a300b998c0556603817dbb5826df00f53ca51933a484b41f4bd60f4' 
  AND token = 'U6y09Ux4te/3qcRX8av2Bmw9UfJv1Ic7LaLQIlYShT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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