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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60de1ed58e4691bbfdc4b33c25eacabc6d9e77ef729175e472b5409af0ccf542' 
  AND token = 'YLIQKNCkXmJAA8eYLF4oLe5E93EvQ5xca2aR6/YtMZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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