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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1834ed5ac6209adec0d67a9d046919a43af33d9cbb6b59695651891e4fba7d8b' 
  AND token = '2P06IJgo44IXm2KQPjgUZCEC0vh+q8j5TIuOkC04HEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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