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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d34b64785ef617ef50aeced0c9b4bb70c1cbe01283b73ca1f384f48ed17d34f' 
  AND token = 'nETX6S10Q6UJaBLmN2g6WFEec2pC76C8PcLNF7f2UZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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