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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0045964c99023cd973d87555ef1c0e08d19c1d8f425ee3fd3cf801fd014d5fd1' 
  AND token = 'QGDIEHDV/FZ39kcLYYICRVQWIBG3KttUoBlrJ9jH/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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