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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3686a63c661511223f9e557b65ea8344ea3fda895d1646f394df656145985f' 
  AND token = 'HG1ffpaO31dc+Fx3+cTpHVaqg9ybnL+VUjl02PVey38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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