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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68e7dd3659f5a79d8c2485d1d1e42810ac6ce1a2eeba8f7698113c411269f02' 
  AND token = 'F8fxojZjAngixJGMYESHaENOXeI3wQxv+IKwTumQoto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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