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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b23f69912b69b0356c85412b637eaf7261a51ef7389e3b9a5e5e51d804f9cd8' 
  AND token = '0tvRkw+KTXVQb0pno90xP/55yt06RVps9MWnHtCDr/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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