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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ab6d2a8a17dfd4f9dfed39f644d88ddf6fdce1cf19f87f9724cf194dda1f2f' 
  AND token = '6q8UA/HpH6b9N57rOEgo5ioImQOTsz2ZdIEb3XyCW24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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