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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bf5315e0377edea833ffe5eca52e82fe732b2f49ddecfc20c9f41d7b1c489d' 
  AND token = 'nfgJYuFY+d91etrOSQZcUSXjiMAG+YHszTPI6azRYAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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