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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f14e3bde4f4971a12b615d60c9bf6f9c08a5a5186c6ccbb07d41dcf3723a42' 
  AND token = 'p6UvjFWIgnO9aYzjTLF8U9XEj47mFuqDit/D85xdZTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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