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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c603056a9ae04d3c14dfc446a977e5a96d1f02a933ded7220a0bd74755a5f4dc' 
  AND token = 'zMlSnEkaz+KgC3P2MOn9lm9OZKD2wSSlFNrykBryVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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