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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6d9737d14eb17e2f49a60776092a8ef247bba114a764a80bbf16ab187f3a18' 
  AND token = 'hNiosUSCCRteA4op/4njoju2MYyM6M9MScbD6amGZS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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