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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a77a56ed9a5bc3bc6594598d4687e01572dacd8ffd2a0c018abf156dd66f8d' 
  AND token = 'yt68ERo74C1FaAuFucAhgnJIEXbzV3m5uc7yuwjJzds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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