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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb12e540a9969bc8a7f263b643361795953acf38dd82bf5fd0ce301d4eb96115' 
  AND token = '960j9u5pExNJd+n39sKT2bKi1JRj3b6lHlXuEVBrE7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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